Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/Azure/go-ansiterm/osc_string_state.go

@@ -1,31 +0,0 @@
-package ansiterm
-
-type OscStringState struct {
-	BaseState
-}
-
-func (oscState OscStringState) Handle(b byte) (s State, e error) {
-	logger.Infof("OscString::Handle %#x", b)
-	nextState, err := oscState.BaseState.Handle(b)
-	if nextState != nil || err != nil {
-		return nextState, err
-	}
-
-	switch {
-	case isOscStringTerminator(b):
-		return oscState.parser.Ground, nil
-	}
-
-	return oscState, nil
-}
-
-// See below for OSC string terminators for linux
-// http://man7.org/linux/man-pages/man4/console_codes.4.html
-func isOscStringTerminator(b byte) bool {
-
-	if b == ANSI_BEL || b == 0x5C {
-		return true
-	}
-
-	return false
-}